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Misfiring

Tiny
THOMAS808
  • MEMBER
  • 1989 FORD F-250
  • V8
  • 4WD
  • AUTOMATIC
  • 1,111,111 MILES
Hello everyone.I have the truck listed above with a 460.
I change 2 fuel pumps and the hole distributor. Now it does not want to start it just misfires like, so I got a coil and still the same.I have lots of gas going in. It sounds like it want to start but it's just misfiring. So I wonder if it could be the ignition switch?I really don't no what else to do.
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Sunday, April 18th, 2021 AT 10:25 PM

62 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

This could be from injectors that are are not flowing fuel or enough fuel into the engine from being clogged. There is no additive that will clean them. With the age of the truck, they may have to be replaced. I attached the procedure below for removing the fuel manifold for you.

https://www.2carpros.com/articles/how-to-replace-a-fuel-injector

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Also, I attached the wiring diagram for you as well for the ignition system. With the key in the on position, check the voltage at the positive side of the coil for battery voltage.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Roy
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Monday, April 19th, 2021 AT 1:26 AM
Tiny
THOMAS808
  • MEMBER
  • 46 POSTS
Good morning.I even put fuel in the card and it still does not start.I just got a brand new coil and still yet.I do not know what else to do.I pretty much put everything brand new; fuel pump, two of them, brand new distributor, brand new coil, and it does not want to run. Even if I poor gas in the carburetor it wants to start but pop a little. I checked the fuel leader and it has a lot of pressure.
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Monday, April 19th, 2021 AT 10:49 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, did you verify voltage to the coil as I suggested in the previous post?

I would also check the compression to be sure the timing is correct. You should have 140 -160 pounds.

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy
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Monday, April 19th, 2021 AT 12:27 PM
Tiny
THOMAS808
  • MEMBER
  • 46 POSTS
Yes, I got compression. Timing is correct. And I just got a brand new coil.
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Monday, April 19th, 2021 AT 2:01 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What is the compression?

What is the voltage at the coil that I requested?

Roy
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Monday, April 19th, 2021 AT 2:05 PM
Tiny
THOMAS808
  • MEMBER
  • 46 POSTS
It's 150 compression. Never check the coil yet.
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Monday, April 19th, 2021 AT 2:15 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Let me know the results.

Roy
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Monday, April 19th, 2021 AT 2:19 PM
Tiny
THOMAS808
  • MEMBER
  • 46 POSTS
Thank you so much.I really appreciate it.
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Monday, April 19th, 2021 AT 2:24 PM
Tiny
THOMAS808
  • MEMBER
  • 46 POSTS
It's not popping now just crank.
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Monday, April 19th, 2021 AT 2:27 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Monday, April 19th, 2021 AT 2:28 PM
Tiny
THOMAS808
  • MEMBER
  • 46 POSTS
So wired, it does not pop now.I can't get a tester right now. They don't have it in stock where I live in Maui.I have strong blue spark though.
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Monday, April 19th, 2021 AT 2:32 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, let me know when you get the tester so we can do some voltage checks.

Roy
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Monday, April 19th, 2021 AT 3:03 PM
Tiny
THOMAS808
  • MEMBER
  • 46 POSTS
Okay, I will do. It's weird because it used to pop when try cranking and now it doesn't at all.
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Monday, April 19th, 2021 AT 3:10 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, sounds good.

https://www.2carpros.com/articles/engine-backfires-while-running

Roy
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Monday, April 19th, 2021 AT 3:27 PM
Tiny
THOMAS808
  • MEMBER
  • 46 POSTS
Is there any other MSD ignition discharge 6a.6200 that I can use besides the same kind?
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Tuesday, April 20th, 2021 AT 2:21 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Let us cross one bridge at a time. I still need results on voltage checks to determine the reason for this not running.

Roy
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Tuesday, April 20th, 2021 AT 2:29 PM
Tiny
THOMAS808
  • MEMBER
  • 46 POSTS
Hey buddy. Thank you. Don't have any power to none of it. So I'm waiting for get a new MSD then I can check the voltage like you ask. There is no power going into it at all the wire is dead goes to the coil it comes from the MSD ignition discharge box.
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Tuesday, April 20th, 2021 AT 2:38 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It should come from the ignition switch to the MSD box. Did you verify this?

Roy
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Tuesday, April 20th, 2021 AT 2:40 PM
Tiny
THOMAS808
  • MEMBER
  • 46 POSTS
I'll send you a picture when I crank the motor the power should have. But there is not. Only get power on the the MSD no power coming out from the MSD.
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Tuesday, April 20th, 2021 AT 2:45 PM
Tiny
ASEMASTER6371
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Okay, take a few and post them for me to see.

Roy
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Tuesday, April 20th, 2021 AT 2:47 PM

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